Invest in reliability with MERCURY genuine OEM part 34663. factory engineering designed for your exact engine — exactly what your engine was designed around. Aftermarket parts often fail when you need them most. Don’t settle for aftermarket knockoffs. Genuine MERCURY OEM components are engineered to exact factory specifications, not cheap imitations. Marine-grade construction withstands saltwater corrosion, constant vibration, and UV degradation that destroy inferior parts. Investing in OEM quality means avoiding premature failure. Trust the part your engine was designed around. MERCURY OEM 34663 ensures reliability you can trust. After four decades in marine parts, we know what works: factory quality keeps you on the water and out of the repair bay. It’s that simple. FITS: Application: Primarily fits older or specific 2-stroke Mercury and Mariner outboard models, including 65hp (1961-1971), 70hp (1987-1989), 75hp (1984+), 80hp (1978-1989), and 90hp (1978+) STAY OUT ON THE WATER LONGER WITH GENUINE OEM PARTS FROM US BOATWORKS. Over 2 million parts in stock including NLA and hard-to-find parts. Can’t find what you’re looking for? Call or text us: 913-342-0011